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Summary:

# Callback

`public interface Callback`
``

javax.security.auth.callback.Callback

Known indirect subclasses PasswordCallback
PasswordCallback | Underlying security services instantiate and pass a `PasswordCallback` to the `handle` method of a `CallbackHandler` to retrieve password information.

Implementations of this interface are passed to a `CallbackHandler`, allowing underlying security services the ability to interact with a calling application to retrieve specific authentication data such as usernames and passwords, or to display certain information, such as error and warning messages.

`Callback` implementations do not retrieve or display the information requested by underlying security services. `Callback` implementations simply provide the means to pass such requests to applications, and for applications, if appropriate, to return requested information back to the underlying security services.

See also:

- `CallbackHandler`
- `PasswordCallback`

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